Treatment and Filtration

Treatment and Filtration
Membrane system

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Ultrafiltration system

The TARGA II Hollow Fiber (HF) ultrafiltration system from Koch Membrane Systems is cost-effective for a variety of applications including drinking water requirements. The hollow-fiber membranes provide greater than 4-log removal of bacteria, viruses, Cryptosporidium and Giardia. The units are certified by UL under ANSI/NSF 61 Drinking Water System Components. The membranes are LT2 compliant and fully automated. The membrane design is based on polyethersulfone (PES) chemistry to increase fiber tensile strength. 888/677-5624;

Screen filter

A self-cleaning screen filter from Forsta Filters uses system pressure to clean itself. A rigid cylinder screen strains particles, trapping debris on the inside. The buildup causes differential pressure across the inlet and outlet. A controller monitors the filter and opens a flush valve when it senses adequate pressure. This creates rapid flow through the internal cleaning apparatus, which vacuums buildup from the screen and expels it.

The backwash cycle does not require the entire system flow to stop and reverse. Instead, a point-of-suction backwash reverses flow across the screen only directly in front of suction nozzles. This allows the cleaning mechanism to scan and clean the screen incrementally without disrupting the main flow through the filter. Single units accommodate flow rates up to 8,000 gpm. 888/936-7782;

Measuring principle

The spectro::lyser measuring principle from s::can Measuring Systems measures UV and visible spectrum radiation (UV-Vis). It quantifies changes in TOC or COD, helps identify several differentiated groups of organics, and can detect individual organic substances. It can distinguish between normal and abnormal organic composition using event detection sy­stems, allowing treatment plants to create spectral fingerprints of incoming water. 888/694-3230;

Current meter

The Streaming Current Meter (SCM) from IN USA helps water treatment facilities control water quality by measuring and regulating continuous online coagulant dosage. The meter measures the charge on suspended particles. It is suited for measuring and controlling coagulant dosage in flocculation systems. It minimizes jar testing and zeta potential measurement in the lab and saves coagulant usage. 781/444-2829;

Membrane system

The Aqua UltraFiltration membrane system from Aqua-Aerobic Systems offers a compact T-rack design, zero-break fibers and no air scouring. The multibore fibers are made of polyethersulphone (PES) with seven capillaries per fiber for strength. The alternating top and bottom feed and inside-out filtration flow provides uniform filtrate and backwash flows to minimize plugging, chemical usage and cleaning frequency.

The membranes can be cleaned at a higher pH with caustic instead of chlorine. Smaller, uniform pores provide 6-log removal for bacteria and 4-log removal for viruses. The systems are suited to drinking water, reverse osmosis pre-treatment, industrial water treatment, tertiary wastewater treatment, and reuse applications. 800/940-5008;

Laser nephelometer

The FilterTrak 660sc from Hach ensures that small changes in turbidity measurements accurately represent real turbidity events by detecting turbidity changes as low as 0.0003 NTU. Operators can detect impending filter breakthrough, delineate filter ripening, and maximize effective filter run time. Using advanced laser optics and signal processing, the instrument detects submicron particles that are often precursors to larger particles. 800/227-4224;

GAC pressure filters

WesTech granular activated carbon (GAC) pressure filters effectively remove low-molecular-weight contaminants, especially dissolved organic compounds responsible for poor taste and odor in drinking water. In pretreatment, the filters prolong the life and efficiency of demineralizing ion exchange resins and reverse osmosis membranes.

These filters utilize a pressure vessel, typically with a conical underdrain for convenient GAC media replacement. They are sized according to contact time and desired media replacement frequency. Filter piping for multiple units can be arranged to easily change flow paths between parallel flow, series (lead/lag or daisy chain) flow, or single-unit flow. 801/265-1000;

THM removal system

The GridBee Floating Spray Nozzle THM Removal System removes all four types of regulated trihalomethanes from potable water storage tanks and clearwells with flow rates up to 100 mgd. Scalable systems are custom-engineered according to tank size and hydraulics and install with minimal infrastructure changes. 866/437-8076;

Filter system

The Lakeside MicroStar Filter offers high quality filtration. Process water flows into the MicroStar drum and through the filter media. As the process water flows from the inside to the outside of the drum, the filter captures solids. At a predetermined water level, the backwash cleaning sequence automatically initiates, using a dual spray system. 630/837-5640;

Filtration process

Kruger offers the ACTIFLO Carb process to enhance removal of natural organic matter, taste and odor, endocrine disruptors and pesticides with the combined benefits of ballasted clarification and adsorption on powdered activated carbon (PAC). The process applies to both drinking water and wastewater. PAC is recycled within the process. The process is adaptable to changes in raw water quality. The process train can be used with or without PAC based on seasonal demands. 919/677-8310;


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